IRIS provides line profiles in Mg II k and h lines (2796.4 Å and 2803.5 Å respectively), Si IV (1393.76 Å, 1402.77 Å) and C II (1334.54 Å, 1335.72 Å) lines along the four slit positions (slit length of 202 pixels equivalent to 62\(\mbox{$~\!\!^{\prime \prime }$}\) ). The Mg II h and k lines are formed at chromospheric temperatures, e.g. between 8000 K and 20000 K ([1]}; [2]}; [3]}). C II is formed around T = 30,000 K and Si IV around 80,000 K.
Many other chromospheric and photospheric lines have been identified in the spectra of the mini flare (Table REF ).
<TABLE><FIGURE>